asus-zenbook-backlight-sync

Sync the Backlight of the Asus ScreenPad (secondary) display with the brightness of the Intel (primary) display.

What does this do?

This script installs a small background service that automatically keeps your Asus ScreenPad (Pro Duo Display) brightness in sync with your main screen's brightness.

How to use

1. Download or clone this repository

git clone https://github.com/pgarsk/asus-zenbook-backlight-sync.git
cd asus-zenbook-backlight-sync

2. Run the installer script as root

You need to run the script with root privileges because it installs a system service and needs access to backlight controls.

sudo ./install_screenpad_sync.sh

3. Follow the prompts

• Install: Sets up the sync service so it starts automatically and runs in the background.
• Uninstall: Removes the service and all installed files.
• Quit: Exits without making changes.

4. That's it!

• After installation, your ScreenPad brightness will always match your main display.
• The service will start automatically on boot.

Troubleshooting

• Make sure you are running on an Asus Zenbook with a ScreenPad.
• You must run the script as root (use sudo).
• If you see errors about missing files, your device may not use the same backlight paths. This script expects:
  • /sys/class/backlight/intel_backlight/
  • /sys/class/backlight/asus_screenpad/

Uninstall

Run the script again and choose Uninstall.

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Note: This script is provided as-is. Use at your own risk.